U.S. patent application number 11/340144 was filed with the patent office on 2007-05-10 for slot and multi-inverted-f coupling wideband antenna and electronic device thereof.
Invention is credited to Chih-Ming Wang.
Application Number | 20070103367 11/340144 |
Document ID | / |
Family ID | 38003235 |
Filed Date | 2007-05-10 |
United States Patent
Application |
20070103367 |
Kind Code |
A1 |
Wang; Chih-Ming |
May 10, 2007 |
Slot and multi-inverted-F coupling wideband antenna and electronic
device thereof
Abstract
A slot and multi-inverted-F coupling wideband antenna and an
electronic device using the aforementioned wideband antenna are
disclosed. The antenna includes at least a ground portion, a first
radiation portion, a second radiation portion, a third radiation
portion, a fine tuning metal portion, and a transmission cable. The
first radiation portion is electrically coupled to the ground
portion. The fine tuning metal portion is electrically coupled to
the first radiation portion. The second radiation portion is
electrically coupled to the fine tuning metal portion and forms a
first inverted-F antenna with the first radiation portion. The
third radiation portion is electrically coupled to the fine tuning
metal portion and forms a second inverted-F antenna with the first
radiation portion. The transmission cable is electrically coupled
to one of the first radiation portion and the fine tuning metal
portion.
Inventors: |
Wang; Chih-Ming; (Hsinchu
City, TW) |
Correspondence
Address: |
J.C. Patents, Inc.;Suite 250
4 Venture
Irvine
CA
92618
US
|
Family ID: |
38003235 |
Appl. No.: |
11/340144 |
Filed: |
January 25, 2006 |
Current U.S.
Class: |
343/700MS ;
343/767 |
Current CPC
Class: |
H01Q 9/42 20130101; H01Q
13/10 20130101; H01Q 5/371 20150115 |
Class at
Publication: |
343/700.0MS ;
343/767 |
International
Class: |
H01Q 1/38 20060101
H01Q001/38 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 9, 2005 |
TW |
94139234 |
Claims
1. A slot and multi-inverted-F coupling wideband antenna,
comprising: a ground portion; a first radiation portion, coupled to
the ground portion; a fine tuning metal portion, coupled to the
first radiation portion; a second radiation portion, coupled to the
fine tuning metal portion, and forming a first inverted-F antenna
with the first radiation portion; a third radiation portion,
coupled to the fining tune metal portion, and form a second
inverted-F antenna with the first radiation portion; and a
transmission cable, coupled to one of the first radiation portion
and the fine tuning metal portion.
2. The slot and multi-inverted-F coupling wideband antenna as
claimed in claim 1, wherein when the transmission cable feeds in
signals from the first radiation portion, the first radiation
portion and the ground portion form a slot antenna.
3. The slot and multi-inverted-F coupling wideband antenna as
claimed in claim 2, wherein the area of the fine tuning metal
portion is used for adjusting the impedance matching of the slot
antenna.
4. The slot and multi-inverted-F coupling wideband antenna as
claimed in claim 2, wherein the operating bandwidth of the slot
antenna is between 5 GHz to 6 GHz.
5. The slot and multi-inverted-F coupling wideband antenna as
claimed in claim 1, wherein when the transmission cable feeds in
the signals from the fine tuning metal portion, the fine tuning
metal portion, the first radiation portion, and the ground portion
form a slot flat antenna.
6. The slot and multi-inverted-F coupling wideband antenna as
claimed in claim 5, wherein the area of the fine tuning metal
portion is used for adjusting the impedance matching of the slot
flat antenna.
7. The slot and multi-inverted-F coupling wideband antenna as
claimed in claim 5, wherein the operating bandwidth of the slot
flat antenna is between 5 GHz to 6 GHz.
8. The slot and multi-inverted-F coupling wideband antenna as
claimed in claim 1, wherein a plurality of extensions of the second
radiation portion and the third radiation portion are parallel with
each other.
9. The slot and multi-inverted-F coupling wideband antenna as
claimed in claim 8, wherein the difference in the lengths of the
second radiation portion and the third radiation portion is based
on up to 1 to 2 percent more or less than the average wavelengths
of the signals transmitted and received by the second radiator and
the third radiator.
10. The slot and multi-inverted-F coupling wideband antenna as
claimed in claim 1, the operating bandwidth of the first inverted-F
antenna and the second inverted-F antenna is from 2.2 GHz to 2.6
GHz.
11. The slot and multi-inverted-F coupling wideband antenna as
claimed in claim 1, wherein the transmission cable is a mini
coaxial cable.
12. An electronic device, comprising: a ground portion; a first
radiation portion, coupled to the ground portion; a fine tuning
metal portion, coupled to the first radiation portion; a second
radiation portion, coupled to the fine tuning metal portion, and
forming a first inverted-F antenna with the first radiation
portion; a third radiation portion, coupled to the fine tuning
metal portion, and forming a second inverted-F antenna with the
first radiation portion; and a transmission cable, coupled to one
of the first radiation portion and the fine tuning metal
portion.
13. The electronic device as claimed in claim 12, wherein when the
transmission cable feeds in signals from the first radiation
portion, the first radiation portion and the ground portion form a
slot antenna.
14. The electronic device as claimed in claim 13, wherein the area
of the fine tuning metal portion is used for adjusting the
impedance matching of the slot antenna.
15. The electronic device as claimed in claim 13, wherein the
operating bandwidth of the slot antenna is from 5 GHz to 6 GHz.
16. The electronic device as claimed in claim 12, wherein when the
transmission cable feeds in the signals from the fine tuning metal
portion, the fine tuning metal portion, the first radiation
portion, and the ground portion form a slot flat antenna.
17. The electronic device as claimed in claim 16, wherein the area
of the fine tuning metal portion is used for adjusting the
impedance matching of the slot flat antenna.
18. The electronic device as claimed in claim 16, wherein the
operating bandwidth of the slot flat antenna is from 5 GHz to 6
GHz.
19. The electronic device as claimed in claim 12, wherein the
extensions of the second radiation portion and the third radiation
portion are parallel with each other.
20. The electronic device as claimed in claim 19, wherein the
difference in the lengths of the second radiation portion and the
third radiation portion is based on up to between 1 to 2 percent
more or less than the average wavelengths of the signals
transmitted and received by the second radiator and the third
radiator.
21. The electronic device as claimed in claim 12, the operating
bandwidth of the first inverted-F antenna and the second inverted-F
antenna is from 2.2 GHz to 2.6 GHz.
22. The electronic device as claimed in claim 12, wherein the
transmission cable is a mini coaxial cable.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the priority benefit of Taiwan
application serial no. 94139234, filed on Nov. 9, 2005. All
disclosure of the Taiwan application is incorporated herein by
reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of Invention
[0003] The present invention relates to an antenna. More
particularly, the present invention relates to a slot and
multi-inverted-F coupling wideband antenna and an electronic device
thereof.
[0004] 2. Description of Related Art
[0005] In keeping pace with progress in telecommunication
technology, application of the telecommunication technology for
hi-tech products has been increasing and related telecommunication
products have become diversified. In recent years, the consumer
functional requirements for telecommunication products have become
increasingly higher; therefore, telecommunication products with
various designs and functions are continuously brought to market,
such as the design consolidation of telecommunication products with
dual-band and triple-band, the computer network products with
wireless networks are in demand. In addition, due to the maturity
of integrated circuit technologies, the trend for products is
leading towards lighter, thinner, and smaller.
[0006] In telecommunication products, the main function of an
antennas is for transmitting and receiving signals. Today, as the
trend for products is towards lighter, thinner, and smaller, the
inverted-F antennas have become more popular in the market. FIG. 1
is a structural schematic diagram of a conventional inverted-F
antenna. The antenna mainly includes a radiator 101, a ground plate
102, and a signal source 103. In addition, an antenna length 104 is
also shown in FIG. 1. Because the radiator 101 and the signal
source 103 form a shape of an inverted F, it is called an
inverted-F antenna. The aforementioned type of antenna mainly makes
use of the principle of current excitation.
[0007] In addition, Hon Hai Precision Industry Co. Ltd has
presented a dual frequency antenna under a U.S. Pat. No. 6,812,892.
FIG. 2 is a structural schematic diagram of a conventional dual
frequency inverted-F antenna under the U.S. Pat. No. 6,812,892. The
antenna includes two inverted-F antennas, which are illustrated in
FIG. 2 as the first inverted-F antenna 201 and the second
inverted-F antenna 202. Two radiators 204 and 205 are extended from
the tail end of the original inverted-F antenna, so that a dual
inverted-F antenna is formed. In which, the shorter antenna 202 is
used for receiving higher frequency signals such as 5.2 GHz signals
under radio communication protocol 802.11a while the longer antenna
201 is used for receiving lower frequency signals such as 2.45 GHz
signals under radio communication protocol 802.11b.
[0008] FIG. 3 is the voltage standing wave ratio (VSWR) diagram of
the aforementioned conventional antenna in FIG. 2. As can be
determined from FIG. 3, the lower range operating frequency of the
antenna is around 2.45 GHz while the higher range operating
frequency is around 5 GHz to 6 GHz. However, based on modern
applications, for example, the Worldwide Interoperability for
Microwave Access (WIMAX) brought forward by Intel Co. requires a
bandwidth between 2.3 GHz to 2.5 GHz. The antenna in FIG. 2 cannot
provide such a large bandwidth.
SUMMARY OF THE INVENTION
[0009] Accordingly, the present invention is directed to provide a
slot and multi-inverted-F coupling wideband antenna with a wider
bandwidth.
[0010] The present invention provides a slot and multi-inverted-F
coupling wideband antenna including at least a ground portion, a
first radiation portion, a fine tuning metal portion, a second
radiation portion, a third radiation portion, and a transmission
cable. The first radiation portion is electrically coupled to the
ground portion. The fine tuning metal portion is electrically
coupled to the first radiation portion. The second radiation
portion is electrically coupled to the fine tuning metal portion
and is formed a first inverted-F antenna with the first radiation
portion. The third radiation portion is electrically coupled to the
fine tuning metal portion and is formed a second inverted-F antenna
with the first radiation portion. In addition, the transmission
cable is selectively electrically coupled to the first radiation
portion and the fine tuning metal portion.
[0011] According to the slot and multi-inverted-F coupling wideband
antenna of an embodiment of the present invention, the
aforementioned second radiation portion and the third radiation
portion are parallel with each other, which causes a coupling
effect and forms a wideband antenna.
[0012] The present invention provides an electronic device, which
includes an antenna including a ground portion, a first radiation
portion, a fine tuning metal portion, a second radiation portion, a
third radiation portion, and a transmission cable. The first
radiation portion is electrically coupled to the ground portion.
The fine tuning metal portion is electrically coupled to the first
radiation portion. The second radiation portion is electrically
coupled to the fine tuning metal portion and is formed a first
inverted-F antenna with the first radiation portion. The third
radiation portion is electrically coupled to the fine tuning metal
portion and is formed a second inverted-F antenna with the first
radiation portion. In addition, the transmission cable is
selectively electrically coupled to the first radiation portion and
the fine tuning metal portion.
[0013] According to the electronic device of an embodiment of the
present invention, the aforementioned second radiation portion and
the third radiation portion are parallel with each other, which
causes a coupling effect and forms a wideband antenna.
[0014] The present invention has adopted the second radiation
portion and the third radiation portion to respectively receive and
transmit signals whose broadcast bands are close to each other, so
that the bandwidth received and transmitted by the antenna is
wider. The slot (flat) antenna produced by the signal source and
the first radiator can receive and transmit the signals of another
broadcast band. The metal plate electrically coupled to the first
radiator can adjust the impedance matching of the slot (flat)
antenna.
[0015] In order to make the aforementioned and other objects,
features and advantages of the present invention comprehensible, an
embodiment accompanied with figures is described in detail
below.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] FIG. 1 is a structural schematic diagram of a conventional
inverted-F antenna.
[0017] FIG. 2 is a structural schematic diagram of a conventional
dual frequency inverted-F antenna of U.S. Pat. No. 6,812,892.
[0018] FIG. 3 is a VSWR diagram of the conventional antenna in FIG.
2.
[0019] FIGS. 4A, 4B, 4C, and 4D illustrate a slot and
multi-inverted-F coupling wideband antenna according to an
embodiment of the present invention.
[0020] FIG. 4E illustrates an electronic device using the antenna
according to the embodiment shown in FIGS. 4A, 4B, 4C, and 4D.
[0021] FIGS. 5A, 5B, 5C, 5D, and 5E illustrate a slot and
multi-inverted-F coupling wideband antenna according to an
embodiment of the present invention.
[0022] FIG. 5F illustrates an electronic device using the antenna
according to the embodiment shown in FIGS. 5A, 5B, 5C, 5D, and
5E.
[0023] FIG. 6 is a VSWR diagram of the antenna according to the
embodiment of the present invention shown in FIG. 5A.
[0024] FIG. 7A is diagram of a horizontal radiation pattern of the
antenna according to the embodiment of the present invention shown
in FIG. 5A.
[0025] FIG. 7B is a data diagram of the radiation field intensity
of the horizontal section of the antenna shown in FIG. 5A of the
embodiment of the present invention and the radiation field
intensity of the horizontal section of the conventional antenna
shown in FIG. 2.
[0026] FIG. 8 is a perspective view of the slot and
multi-inverted-F coupling wideband antenna according to an
embodiment of the present invention.
DESCRIPTION OF THE EMBODIMENTS
[0027] Meeting the requirements of modern science and technology
for wideband and multiband, the present invention provides a slot
and multi-inverted-F coupling wideband antenna. The antenna can
transmit and receive a wider bandwidth in a designated bandwidth.
In addition, the antenna can be used in a plurality of bandwidths.
In the following, an embodiment of the present invention is
described with the accompanying drawings.
[0028] FIGS. 4A, 4B, 4C, and 4D illustrate a slot and
multi-inverted-F coupling wideband antenna of an embodiment of the
present invention. FIG. 4E illustrates an electronic device using
the aforementioned antenna. Referring to FIGS. 4A, 4B, 4C, 4D, and
4E, the electronic device includes the aforementioned antenna 40a
and a RF signal transmission device 41a. The electronic device is,
for example, a notebook computer; the antenna 40a is, for example,
disposed on two sides of the panel of the notebook computer
(Referring to FIG. 4E). Through the transmission cable 42a of the
antenna, the RF signal transmission device 41a is used for
processing the signals received by the antenna 40a or transmitting
the signals to the antenna 40a for radiating. Those skilled in the
art should know that the electronic device can also be a PDA, a
wireless ethernet adapter, a wireless router, etc.
[0029] The antenna 40a includes a ground portion 400, a first
radiation portion 401, a fine tuning metal portion 402, a second
radiation portion 403, a third radiation portion 404, and a
transmission cable 405. The first radiation portion 401 is
electrically coupled to the ground portion 400. The fine tuning
metal portion 402 is electrically coupled to the first radiation
portion 401. The second radiation portion 403 is electrically
coupled to the fine tuning metal portion 402. The third radiation
portion 404 is electrically coupled to the fine tuning metal
portion 402. The transmission cable 405 is electrically coupled to
the first radiation portion 401. In this embodiment, there is a
bump 406 on the contact where the transmission cable 405 is
electrically coupled to the first radiation portion 401. The bump
406 is used to fool-proof by the manufacturers. In addition, the
transmission cable 405 used in the present embodiment is a mini
coaxial cable.
[0030] In the antenna drawings FIGS. 4B, 4C and 4D, it is evident
that the antenna includes a first inverted-F antenna 40 and a
second inverted-F antenna 41 using electric current excitation, and
a slot antenna 42 using magnetic field excitation. In this
embodiment, the first inverted-F antenna 40 and the second
inverted-F antenna 41 are respectively used for receiving signals
of the bands of 2.3 GHz and 2.5 GHz, while the slot antenna 42 is
used for receiving signals of the bands from 5 GHz to 6 GHz. An
overall length L40 of the first inverted-F antenna 40 is
illustrated in FIG. 4. An overall length L41 of the second
inverted-F antenna 41 is illustrated in FIG. 4. In addition, an
overall length L42 of the slot antenna 42 is illustrated in FIG.
4.
[0031] Here an assumption is made for the embodiment in FIG. 4.
First, it is assumed that the first inverted-F antenna 40 is used
for receiving signals of the band of 2.3 GHz and the second
inverted-F antenna 41 is used to receive signals of the band of 2.5
GHz. Thus, the length of the first inverted-F antenna 40 is a
slightly longer than the second inverted-F antenna 41. In the
embodiment, the second radiation portion 403 is designed at about
1% to 2% of the 2.4 GHz signal wavelength longer than the third
radiation portion 404, namely from 0.125 cm to 0.25 cm. Here, the
second radiation portion 403 can be designed close to and parallel
with the third radiation portion 404, so that the first inverted-F
antenna 40 and the second inverted-F antenna 41 produce a coupling
effect to form a wideband antenna which can transmit and receive
signals in the 2.2 GHz to 2.6 GHz range.
[0032] According to the foregoing embodiment of the present
invention, those skilled in the art should be well aware that if
the above assumption is changed to that the first inverted-F
antenna 40 to be used for receiving signals of the band of 2.5 GHz
and the second inverted-F antenna 41 to be used to receive signals
of the band of 2.3 GHz, the the length of the first inverted-F
antenna 40 is slightly shorter than the second inverted-F antenna
41, and the third radiation portion 404 is designed at about 1% to
2% of the 2.4 GHz signal wavelength longer than the second
radiation portion 403. In the same way, the first inverted-F
antenna 40 and the second inverted-F antenna 41 also produce a
coupling effect to form a wideband antenna.
[0033] In addition, the fine tuning metal portion 402 can be used
for adjusting the impedance matching of the slot antenna 42. A
width W402 of the fine tuning metal portion 402 can adjust the
change of the field form of the horizontal radiation pattern. The
wider the width W402, the stronger the radiation energy is becomed.
In addition, when the length L402 of the fine tuning metal portion
402 is longer, the lengths L40 and L41 of the first inverted-F
antenna 40 and the second inverted-F antenna 41 correspondingly
become longer; therefore, the frequencies of the signals that the
first inverted-F antenna 40 and the second inverted-F antenna 41
can transmit and receive are also decreased correspondingly.
[0034] FIGS. 5A, 5B, 5C, 5D, and 5E respectively illustrate a slot
and multi-inverted-F coupling wideband antenna according to an
embodiment of the present invention. FIG. 5F illustrates an
electronic device using the antenna of the above embodiment.
Referring to FIGS. 5A, 5B, 5C, 5D, and 5F, in which the electronic
device includes an antenna 50a and the RF signal transmission
device 51a of the foregoing embodiment of the present invention.
Giving an example with a notebook computer for this electronic
device, the antenna 50a is for example disposed on two sides of the
panel of the notebook computer (Referring to FIG. 5F). Through the
transmission cable 52a of the antenna 50a, the RF signal
transmission device 51a processes the signals received by the
antenna 50a or transmits the signals to the antenna 50a to radiate.
Those skilled in the art should be well aware that the electronic
device can also be a PDA, a wireless network adapter, a wireless
router, etc.
[0035] The antenna 50a includes a ground portion 500, a first
radiation portion 501, a fine tuning metal portion 502, a second
radiation portion 503, a third radiation portion 504, and a
transmission cable 505. The first radiation portion 501 is
electrically coupled to the ground portion 500. The fine tuning
metal portion 502 is electrically coupled to the first radiation
portion 501. The second radiation portion 503 is electrically
coupled to the fine tuning metal portion 502. The third radiation
portion 504 is electrically coupled to the fine tuning metal
portion 502. The transmission cable 505 is electrically coupled to
the fine tuning metal portion 502. In addition, in this embodiment,
a bump 506 is laid on a contact where the transmission cable 505 is
electrically coupled to the fine tuning metal portion 502. The bump
506 is used by the manufacturers for fool-proof.
[0036] In the same way, the embodiment of the antenna 50a includes
three antennas: a first inverted-F antenna 50 as in FIG. 5B, a
second inverted-F antenna 51 as in FIG. 5C, and a slot antenna 52
as in FIG. 5D. The principle of the antenna 5Oa is similar to that
of the embodiment shown in FIGS. 4A, 4B, 4C, and 4D, thus further
descriptions are not needed. However, in addition to the method of
operation of the slot antenna 52 shown in FIG. 5D, the antenna can
also be of the form of the slot flat antenna 53 shown in FIG. 5E,
whose length L53 is shown in FIG. 5E. The fine tuning metal portion
502 of this embodiment is the same as the one shown in FIGS. 4A,
4B, 4C, and 4D, whose length L502 and width W502 can be used for
adjusting the parameters of the antenna. For example, the length of
L502 becoming longer would result in a decrease of the frequencies
of the first inverted-F antenna 50 and the second inverted-F
antenna 51; the wider the width W502, the stronger the radiation
energy is becomed. However, in the embodiment of the slot flat
antenna 53 shown in FIG. 5E, upon the length L502 becomes longer or
the width W502 becomes wider, the frequency of the signals
transmitted and received by the slot flat antenna 53 would be
decreased.
[0037] In addition, the first inverted-F antenna 50 and the second
inverted-F antenna 51 in the embodiment form a wideband antenna due
to the coupling effect, whose method of operation is the same as
the embodiment in FIG. 4 above.
[0038] FIG. 6 is a VSWR diagram of the antenna 50a of the
embodiment of the present invention shown in FIG. 5A. Referring to
FIG. 6, generally, based on the industrial standard of antennas for
common personal computers and notebook computers, the VSWR is less
than or equal to two. According to the above standard, antennas can
receive high quality signals within a given band. Therefore, from a
portion 601 shown in FIG. 6, it is obvious that because of the
coupling effect produced by the second and third radiation portions
of the embodiment of the present invention, the wideband antenna
has a bandwidth of more that 400 MHz. As to the industry standard
of antenna of Portable Digital Assistant (PDA), the preferred VSWR
is less than or equal to three, thus a wider bandwidth can be
achieved according to the antenna 50a of the embodiment of the
present invention.
[0039] FIG. 7A is a diagram of a horizontal radiation pattern of
the antenna 50a of the embodiment of the present invention shown in
FIG. 5A. FIG. 7B is a data diagram of the radiation field intensity
of the horizontal section of the antenna shown in FIG. 5A of the
embodiment of the present invention and the radiation field
intensity of the horizontal section of the conventional antenna
shown in FIG. 2. From FIG. 7A, it can be seen that the antenna 50a
of the embodiment of the present invention is an omnidirectional
antenna. By comparing a testing result 701 of the embodiment of the
present invention and a testing result 702 of the conventional
antenna shown in FIG. 2, it can be seen that the average intensity
of the radiation field of the antenna 50a of the embodiment of the
present invention is higher than the one of the conventional
antenna shown in FIG. 2 when they are applied in the same band.
[0040] FIG. 8 is a perspective view of the slot and
multi-inverted-F coupling wideband antenna according to an
embodiment of the present invention. In the embodiment, the fine
tuning metal portion 801 has a bent edge 802, whose center line is
parallel with the second radiation portion 804 and is disposed
between the second radiation portion 804 and the third radiation
portion 805. Using the above structure, the height of the antenna
50a can further be decreased. In modern products, such as notebook
computers, the overall frames of the liquid crystal panels have
become thinner and thinner. If the antennas required to be built
into the frames of the liquid crystal panels, the length of the
antennas must be sufficiently short. In this regard, the
aforementioned embodiment could be used. Those skilled in the art,
in reference to the embodiment of the present invention, should be
aware that the bent edge can also be made between the first
radiation portion and the second radiation portion, or between the
first radiation portion and the ground portion for reducing the
height of the antenna of the present invention.
[0041] In summary, the present invention uses the second radiation
portion and the third radiation portion to respectively receive and
transmit signals whose bands are tighter to each other, so that the
bandwidth received and transmitted by the antenna is wider. The
slot (flat) antenna formed by the signal source and the first
radiator can receive and transmit the signals of another band. The
metal plate electrically coupled with the first radiator can adjust
the impedance matching of the slot (flat) antenna.
[0042] The present invention is disclosed above with its preferred
embodiments. It is to be understood that the preferred embodiment
of present invention is not to be taken in a limiting sense. It
will be apparent to those skilled in the art that various
modifications and variations can be made to the structure of the
present invention without departing from the scope or spirit of the
invention. The protection scope of the present invention is in
accordant with the scope of the following claims and their
equivalents.
* * * * *